CN106505944A - A kind of virtual ground system of anti-photovoltaic panel PID effect - Google Patents

A kind of virtual ground system of anti-photovoltaic panel PID effect Download PDF

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Publication number
CN106505944A
CN106505944A CN201610921495.0A CN201610921495A CN106505944A CN 106505944 A CN106505944 A CN 106505944A CN 201610921495 A CN201610921495 A CN 201610921495A CN 106505944 A CN106505944 A CN 106505944A
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photovoltaic panel
ground
negative pole
virtual ground
voltage
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CN201610921495.0A
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CN106505944B (en
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李建飞
夏孝云
张林江
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Sineng Electric Co Ltd
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Sineng Electric Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

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  • Emergency Protection Circuit Devices (AREA)
  • Photovoltaic Devices (AREA)
  • Inverter Devices (AREA)

Abstract

The present invention discloses a kind of virtual ground system of anti-photovoltaic panel PID effect, including virtual ground device, the virtual ground device is sealed between photovoltaic panel negative pole and ground, the virtual ground device is according to photovoltaic panel positive pole insulation against ground situation, adjust out corresponding equiva lent impedance, this impedance and photovoltaic panel positive pole equiva lent impedance partial pressure over the ground, and then change photovoltaic panel negative pole voltage-to-ground, and cause leakage current controllable.The present invention ensure to greatest extent anti-PID effects effect, control leakage current, also can suppress PID effects all the period of time, though inverter do not start shooting also still effective.

Description

A kind of virtual ground system of anti-photovoltaic panel PID effect
Technical field
The present invention relates to anti-photovoltaic panel PID effect technical field, more particularly to a kind of virtuality of anti-photovoltaic panel PID effect connects Ground system.
Background technology
Potential induction attenuation (Potential Induced Degradation, PID) can cause cell panel characteristic to decline Subtract, affect generated energy.Under hot and humid environment, this phenomenon shows particularly evident.Since this effect was found from 2005, respectively Photovoltaic battery panel producer and inverter producer all solve this problem being devoted to finding simpler more efficient method.PID is imitated Should between cell panel negative pole and ground, the presence of negative pressure, and then caused by causing sodium ion skew, thus actively the method for anti-PID be allow negative Pole voltage-to-ground more than certain negative value or is equal to 0V, allows sodium ion not shift substantially.The virtual ground that industry is adopted now Scheme is to generate virtual midpoint in system AC, reuses voltage source lifting midpoint voltage-to-ground so that cell panel negative pole pair Ground voltage reduces, and reaches the purpose of anti-PID.But, there are 2 points of deficiencies in this scheme：One is that device is when inverter cuts out Failure, i.e., earthing or grounding means is cut off with DC side path；Two is to need to damage device using resistance or inductance etc. when forming midpoint Part, will produce excess loss.
Content of the invention
It is an object of the invention to by a kind of virtual ground system of anti-photovoltaic panel PID effect, solving background above The problem that technology segment is mentioned.
It is that the present invention is employed the following technical solutions up to this purpose：
A kind of virtual ground system of anti-photovoltaic panel PID effect, which includes virtual ground device, the virtual ground device Seal between photovoltaic panel negative pole and ground, the virtual ground device is adjusted out corresponding according to photovoltaic panel positive pole insulation against ground situation Equiva lent impedance, this impedance and photovoltaic panel positive pole equiva lent impedance partial pressure over the ground, and then change photovoltaic panel negative pole voltage-to-ground, and making Obtain leakage current controllable.
Especially, the virtual ground device specifically for：The equiva lent impedance for making virtual ground device is Rx, effectively can resist The photovoltaic panel negative pole voltage-to-ground of PID effects is Unpe, and photovoltaic panel positive pole bond impedance over the ground is Rp, and photovoltaic panel voltage is Upv, the leakage current value detected by virtual ground device are Ilk, residual current protection value is Ilkmax；When normal work or photovoltaic panel There is impedance bond, but I in positive polelk＜ IlkmaxWhen, virtual ground device adjusts equivalent impedance Rx and is：
It is I when positive pole occurs serious overlap jointlk≥IlkmaxWhen, now protection overlap joint person priority is high, and virtual ground device is adjusted Whole equiva lent impedance so that leakage current is less than protection value, i.e. equiva lent impedance Rx：
Especially, the virtual ground device includes photovoltaic panel voltage sample module, negative pole voltage-to-ground sampling module, opens Close device drive control unit, gate-controlled switch device and leak current detection device；Described photovoltaic panel voltage sample module one end Connection photovoltaic panel, other end connecting valve device drive control unit；One end connection of the negative pole voltage-to-ground sampling module Photovoltaic panel negative pole, other end connecting valve device drive control unit；One end connecting valve device of the leak current detection device Part drive control unit, the other end are grounded；The gate-controlled switch device connection negative pole voltage-to-ground sampling module, switching device drive Dynamic control unit, leak current detection device.
Especially, the virtual ground device includes photovoltaic panel voltage sample module, negative pole voltage-to-ground sampling module, opens Close device drive control unit, gate-controlled switch device, some different impedance resistors and leak current detection device；The photovoltaic panel Voltage sample module one end connects photovoltaic panel, other end connecting valve device drive control unit；The negative pole voltage-to-ground is adopted One end connection photovoltaic panel negative pole of egf block, other end connecting valve device drive control unit；The leak current detection device One end connecting valve device drive control unit, the other end be grounded；The gate-controlled switch device connection negative pole voltage-to-ground is adopted Egf block, switching device drive control unit, some different impedance resistors；Some different impedance resistors connection leakage current inspections Survey device.
Especially, the virtual ground device includes photovoltaic panel voltage sample module, negative pole voltage-to-ground sampling module, electricity Dynamic device driver element, slide resistor and leak current detection device；Described photovoltaic panel voltage sample module one end connects light Volt plate, other end connecting valve device drive control unit；One end connection photovoltaic panel of the negative pole voltage-to-ground sampling module Negative pole, other end connecting valve device drive control unit；One end connecting valve device drive of the leak current detection device Control unit, the other end are grounded；One end connection negative pole voltage-to-ground sampling module of the slide resistor, other end connection leakage Current sensing means, electronic slider end connect electric device driver element.
The virtual ground system of anti-photovoltaic panel PID effect proposed by the present invention seals in one between photovoltaic panel negative pole and ground Virtual ground device, virtual ground device adjust its equiva lent impedance in real time, quickly according to leakage current value of feedback, when leakage current is in During normal value, between adjustment equiva lent impedance causes photovoltaic panel negative pole over the ground, voltage is less than certain value, to reach the mesh of anti-PID effects 's；When leakage current is near the mark required upscale protection value, the adjustment impedance of virtual ground device causes leakage current to be less than This protection value.The present invention ensures the effect of anti-PID effects, control leakage current to greatest extent, and PID also can be suppressed all the period of time to imitate Should, though inverter do not start shooting also still effective.
Description of the drawings
Fig. 1 is the virtual ground system construction drawing of anti-photovoltaic panel PID effect provided in an embodiment of the present invention；
Fig. 2 is virtual ground structure drawing of device one provided in an embodiment of the present invention；
Fig. 3 is virtual ground structure drawing of device two provided in an embodiment of the present invention；
Fig. 4 is virtual ground structure drawing of device three provided in an embodiment of the present invention.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.It is understood that tool described herein Body embodiment is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that, for the ease of retouching State, in accompanying drawing, illustrate only part related to the present invention rather than full content, unless otherwise defined, used herein all Technology is identical with the implication that the those skilled in the art for belonging to the present invention are generally understood that with scientific terminology.Used herein Term be intended merely to describe specific embodiment, it is not intended that in limit the present invention.
Refer to shown in Fig. 1, Fig. 1 is the virtual ground system knot of anti-photovoltaic panel PID effect provided in an embodiment of the present invention Composition.
In the present embodiment, the virtual ground system of anti-photovoltaic panel PID effect specifically includes virtual ground device 101, the void Intend earthing or grounding means 101 seal between 102 negative pole PV- of photovoltaic panel and ground, the virtual ground device 101 according to photovoltaic panel 102 just Pole PV+ insulation against ground situations, adjust out corresponding equiva lent impedance, and equiva lent impedance is divided over the ground with 102 positive pole PV+ of photovoltaic panel for this impedance Pressure, and then change 102 negative pole PV- voltage-to-grounds of photovoltaic panel, and cause leakage current controllable.
The virtual ground device 101 specifically for：The equiva lent impedance for making virtual ground device 101 is Rx, effectively can resist The 102 negative pole PV- voltage-to-grounds of photovoltaic panel of PID effects be Unpe, 102 positive pole PV+ of photovoltaic panel bond impedances over the ground be Rp, light 102 voltage of volt plate is Upv, and the leakage current value detected by virtual ground device 101 is Ilk, residual current protection value is Ilkmax；When There is impedance bond, but I in normal work or 102 positive pole PV+ of photovoltaic panellk＜ IlkmaxWhen, virtual ground device 101 adjusts equivalent Resistance value Rx is：
It is I when positive pole PV+ occurs serious overlap jointlk≥IlkmaxWhen, now protection overlap joint person priority is high, and virtual ground is filled Put 101 adjustment equiva lent impedances so that leakage current is less than protection value, i.e. equiva lent impedance Rx：
The present invention can ensure to greatest extent photovoltaic panel negative pole voltage-to-ground in can effectively anti-PID effects numerical value, also exist The purpose of anti-PID effect is equally played when inverter 103 is not incorporated into the power networks.It should be noted that the present invention is usable in separate unit Inverter 103 passes through 104 grid-connected occasion of transformer, it can also be used to pass through 104 grid-connected occasion of transformer after the direct parallel connection of multimachine.
Realize that the mode of virtual ground device 101 is including but not limited to following three kinds in the present embodiment：
First, by the equivalent conduction impedance of current feedback mode controlling switch pipe
As shown in Fig. 2 the virtual ground device 101 includes that photovoltaic panel voltage sample module 201, negative pole voltage-to-ground is adopted Egf block 202, switching device drive control unit 203, gate-controlled switch device 204 and leak current detection device 205；The light 201 one end connection photovoltaic panel of volt plate voltage sample module, other end connecting valve device drive control unit 203；The negative pole One end connection photovoltaic panel negative pole PV- of voltage-to-ground sampling module 202, other end connecting valve device drive control unit 203； One end connecting valve device drive control unit 203 of the leak current detection device 205, the other end are grounded；Described controllable open Close the connection negative pole voltage-to-ground sampling module 202, switching device drive control unit 203, leak current detection device of device 204 205.Wherein 204 type selecting of gate-controlled switch device includes but is not limited to the power electronic devices such as triode, IGBT, MOSFET；Electric leakage Flow detection device includes but is not limited to Hall, current divider etc.；Switching device drive control unit 203 is including but not limited to using hard Part negative-feedback, the functional unit with control chip etc..
2nd, according to current feedback values, the different resistance switchings of control or slide rheostat mode are realized
As shown in figure 3, the virtual ground device 101 includes that photovoltaic panel voltage sample module 301, negative pole voltage-to-ground is adopted Egf block 302, switching device drive control unit 303, gate-controlled switch device (K1-Kn), some different impedance resistors (R1-Rn) And leak current detection device 304；Described 301 one end of photovoltaic panel voltage sample module connects photovoltaic panel, other end connecting valve Device drive control unit 303；One end connection photovoltaic panel negative pole PV- of the negative pole voltage-to-ground sampling module 302, the other end Connecting valve device drive control unit 303；One end connecting valve device drive control of the leak current detection device 304 is single Unit 303, the other end are grounded；Gate-controlled switch device (K1-Kn) connects negative pole voltage-to-ground sampling module 302, switching device Drive control unit 303, some different impedance resistors (R1-Rn)；Some different impedance resistors (R1-Rn) connects leakage current Detection means 304.Wherein, the type selecting of gate-controlled switch device (K1-Kn) includes but is not limited to contactor, relay, powered Breaker of behaviour's function etc.；Leak current detection device 304 includes but is not limited to Hall, current divider etc..
As shown in Figure 4, the virtual ground device 101 includes that photovoltaic panel voltage sample module 401, negative pole voltage-to-ground is adopted Egf block 402, electric device driver element 403, slide resistor Rx and leak current detection device 404；The photovoltaic panel electricity 401 one end of pressure sampling module connection photovoltaic panel, other end connecting valve device drive control unit 403；The negative pole is electric over the ground One end connection photovoltaic panel negative pole PV- of pressure sampling module 402, other end connecting valve device drive control unit 403；The leakage One end connecting valve device drive control unit 403 of current sensing means 404, the other end are grounded；The slide resistor Rx One end connection negative pole voltage-to-ground sampling module 402, the other end connects leak current detection device 404, and 405 end of electronic slide block connects Connect electric device driver element 403.
3rd, in some occasions, virtual ground device 101 also can be realized using thermistor, when leakage current exceedes design load When, thermistor starts to generate heat, and impedance becomes big, reaches the purpose for limiting electric current.
Technical scheme seals in a virtual ground device, virtual ground device between photovoltaic panel negative pole and ground Its equiva lent impedance is adjusted in real time, quickly according to leakage current value of feedback, when leakage current is in normal value, adjustment equiva lent impedance is caused Photovoltaic panel negative pole over the ground between voltage be less than certain value, to reach the purpose of anti-PID effects；Required by being near the mark when leakage current During upscale protection value, the adjustment impedance of virtual ground device causes leakage current to be less than this protection value.The present invention ensures to greatest extent The effect of anti-PID effects, control leakage current, also can suppress PID effects all the period of time, even if inverter is not started shooting also still having Effect.
Above in association with the know-why that specific embodiment describes the present invention.These descriptions are intended merely to explain the present invention's Principle, and limiting the scope of the invention can not be construed to by any way.Based on explanation herein, the technology of this area Personnel associate other specific embodiments of the present invention by need not paying performing creative labour, these modes fall within Within protection scope of the present invention.

Claims (5)

1. a kind of virtual ground system of anti-photovoltaic panel PID effect, it is characterised in that including virtual ground device, the virtuality Earthing or grounding means is sealed between photovoltaic panel negative pole and ground, and the virtual ground device is adjusted according to photovoltaic panel positive pole insulation against ground situation Whole go out corresponding equiva lent impedance, this impedance and photovoltaic panel positive pole equiva lent impedance partial pressure over the ground, and then change photovoltaic panel negative pole over the ground Voltage, and cause leakage current controllable.
2. the virtual ground system of anti-photovoltaic panel PID effect according to claim 1, it is characterised in that the virtuality connects Ground device specifically for：Make virtual ground device equiva lent impedance be Rx, can effectively anti-PID effects photovoltaic panel negative pole electric over the ground Press as Unpe, photovoltaic panel positive pole bond impedance over the ground is Rp, photovoltaic panel voltage is Upv, detected by virtual ground device Leakage current value is Ilk, residual current protection value is Ilkmax；When normal work or photovoltaic panel positive pole occur impedance bond, but Ilk＜ IlkmaxWhen, virtual ground device adjusts equivalent impedance Rx and is：
R x = | U n p e | I l k
It is I when positive pole occurs serious overlap jointlk≥IlkmaxWhen, now protection overlap joint person priority is high, virtual ground device adjustment etc. Effect impedance so that leakage current is less than protection value, i.e. equiva lent impedance Rx：
R x > U p v - I l k m a x * R p I l k m a x .
3. the virtual ground system of the anti-photovoltaic panel PID effect according to claim 1 or 2 any one, it is characterised in that institute Stating virtual ground device includes photovoltaic panel voltage sample module, negative pole voltage-to-ground sampling module, switching device drive control list Unit, gate-controlled switch device and leak current detection device；Described photovoltaic panel voltage sample module one end connects photovoltaic panel, the other end Connecting valve device drive control unit；One end connection photovoltaic panel negative pole of the negative pole voltage-to-ground sampling module, the other end Connecting valve device drive control unit；One end connecting valve device drive control unit of the leak current detection device, separately One end is grounded；The gate-controlled switch device connection negative pole voltage-to-ground sampling module, switching device drive control unit, leakage current Detection means.
4. the virtual ground system of the anti-photovoltaic panel PID effect according to claim 1 or 2 any one, it is characterised in that institute Stating virtual ground device includes photovoltaic panel voltage sample module, negative pole voltage-to-ground sampling module, switching device drive control list Unit, gate-controlled switch device, some different impedance resistors and leak current detection device；Described photovoltaic panel voltage sample module one end Connection photovoltaic panel, other end connecting valve device drive control unit；One end connection of the negative pole voltage-to-ground sampling module Photovoltaic panel negative pole, other end connecting valve device drive control unit；One end connecting valve device of the leak current detection device Part drive control unit, the other end are grounded；The gate-controlled switch device connection negative pole voltage-to-ground sampling module, switching device drive Dynamic control unit, some different impedance resistors；Some different impedance resistors connect leak current detection device.
5. the virtual ground system of the anti-photovoltaic panel PID effect according to claim 1 or 2 any one, it is characterised in that institute Stating virtual ground device includes photovoltaic panel voltage sample module, negative pole voltage-to-ground sampling module, electric device driver element, cunning Dynamic resistor and leak current detection device；Described photovoltaic panel voltage sample module one end connects photovoltaic panel, and other end connection is opened Close device drive control unit；One end connection photovoltaic panel negative pole of the negative pole voltage-to-ground sampling module, other end connection are opened Close device drive control unit；One end connecting valve device drive control unit of the leak current detection device, another termination Ground；One end connection negative pole voltage-to-ground sampling module of the slide resistor, the other end connects leak current detection device, electronic Slider end connects electric device driver element.
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CN108964496A (en) * 2017-05-19 2018-12-07 丰郅(上海)新能源科技有限公司 Improve the electricity generation system and ameliorative way that component caused by potential induction attenuation is decayed
CN109617126A (en) * 2019-01-16 2019-04-12 宁波锦浪新能源科技股份有限公司 A kind of novel anti-PID device
CN110768300A (en) * 2019-12-11 2020-02-07 阳光电源股份有限公司 Wind-solar hybrid power generation system
CN110867900A (en) * 2019-12-11 2020-03-06 阳光电源股份有限公司 Wind-solar hybrid power generation system
CN111474403A (en) * 2020-04-21 2020-07-31 上能电气股份有限公司 Leakage current detection method and device and photovoltaic inverter system

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CN104065285A (en) * 2014-03-31 2014-09-24 华为技术有限公司 Grid-connected inverter system
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CN110768300B (en) * 2019-12-11 2021-09-03 阳光电源股份有限公司 Wind-solar hybrid power generation system
CN110867900B (en) * 2019-12-11 2021-11-02 阳光电源股份有限公司 Wind-solar hybrid power generation system
CN111474403A (en) * 2020-04-21 2020-07-31 上能电气股份有限公司 Leakage current detection method and device and photovoltaic inverter system

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